Barring another 9/11 event, score Will. Not. Change. ALPA won't give in this one outside of bankruptcy style contracts. SKW and TSA cannot fly those MRJs AND retain their contracts with their mainline carriers. Even BBD said that about scope in their annual report.
Re-enginning the CRJ has some significant challenges, especially as new high-compression designs are heavier than the CF-34 derivatives--a difficult problem for an aft mounted design.
GF